Producing vat dyes.



pnrrnn snar s? AEN OSCAR BALLY AND RICHARD TMETZGER, OF MANNHEIM, GERMANY, ASSIGNORS TO BADISCHE ANILIN & SODA FABRIK F LUDWIGSHAFEN-ON-THE-RHINE, GER- MANY, A CORPORATION OF BADEN PRODUCING VAT Dries.

No Drawing.

To all whom it may concern Be it known that We, OSCAR BALLY and' RICHARD METZGER, citizens, respectively, of the Swiss Republic-and the German Empire,

residing at Mannheim, Germany, have m-' vented new and useful Improvements in Producing Vat Dyes, of which the following is a specification.

In the specification of application for patent Serial No. 784,811 one of us has described the production of new vat dyes byintroducing a radical into an amino group of an amino derivative of adibenzanthrone, such radicals including, for instance, an

, alkyl, aryl, aralkyl, aldehyde, or acid radical, or the like. We have now found that when. aldehydic radicals are to be introduced into the said amino groups the introduction can often be advantageously carried out by acting with an aldehyde on a leuco compound of the amino-dibenzanthrone or by employing the amino-dibenzanthrone itself in the present of a reducing agent. -We regard itias equivalent to employ the corresponding nitro-dibenzanthrones in the pres- ,ence of a reducing agent, since in this case the nitro group is reduced to the amino group and consequently the leuco compound of an'amino-dibenzanthrone is produced, on

Which ,the aldehyde' reacts. According to 4o ried out on nitroor amino-dibenzanthr e compounds which have already beeen applied to the fiber.

' As specific instances of compounds which can be treated according to our invention, we

mention amino-dibenzanthrone, amino-isodibenzanthrone, amino-dibenzanthrone quim olin, and nitro-dibenzanthrone.

'As instances, the amino and nitrodiben- Specification'of Letters Patent.

Application filed December 4, 1913. Serial 1i 0. 804,714,-

Patented Nov. 14.,

zanthrones are aminoor nitro derivatives respectively ofthe compound, the structural formula of whlch probably is as follows:

The following examples Will serve to illustrate further the manner in which our invention can be carried into practical effect, but the inventlon is not confined to these examples. The partsiare by weight.

Example 1: Boil together for from 3 to 4:-

hours a solution of 4 parts of sodium formaldehyde sulfoxylate and 10 parts of nitrodibenzanthrone (known in commerce as indanthrene green B paste and obtainable according to the specification of Patent No. 796,393). Pass air through thesolution-obtained .until the coloring matter is precipitated, then filter-it off and press it. It dyes cotton maroon.

Example 2: Mix together 500 parts of hot water, 6 parts of 35% caustic soda solution,

2.5 parts of nitro-dibenzanthrone and 1 part of sodium formaldehyde sulfoxylate. Then introduce the material which is to be dyed,

boil for about 20 minutes, add another partof sodium formaldehyde sulfoxylate and boil for a further 20 minutes. In this way fast maroonshades are obtained.

Example 3: Prepare a printing paste from 20 parts of nitro-dibenzanthrone, 4 parts of calcined soda, 5 parts of glycerin,'63 parts of alkaline thickening (prepared from equal 1 parts of British gum anda 20% sodium carbonate solution) andS parts of sodium forie c.

maldehyde sulfoxylate. Print this paste on to the material, dry, steam for 4: minutes,

and then wash and soap at the boil. On treating the material with dilute hypochlorite. solution, the deep maroon shades are converted into clear maroon.

Example 4: Boil, for about 30 minutes, material which has been dyed with aminodibenzanthrone, in a solution containing 4 parts of calcined soda and 2 parts of sodium formaldehyde sulfoxylate in about 1,000 parts of Water. Then add another 2v parts of sodium formaldehyde sulfoxylate and boil for a further 30 minutes. 'Instead of sodium formaldehyde sulfoxylate, other compounds containing a reducing agent and an aldehyde can be employed, or

' mixtures of these compounds, such for instance as hydrosulfite, together with formal dehyde or benzaldehyde, or the like, can be used. The reaction can be. carried out at var in tem eratures, either above or below the normal boiling point, or even in the cold. 4

Similar methods may beemployed when using other coloring matters of the hereinbefore mentioned type.

Now What we claim is 1. Theprocess of producing vat dyes of the anthraquinone series by reacting with an aldehyde on a leuco compound of an amino derivative of a dibenzanthrone.

2'. The process of producing a vat dye of the anthraquinone series by reacting with an aldehyde on an amino derivative of a dibenzanthrone in the presence of a reducing agent.

3. The process of producing a vat dye of the anthraquinone series by-reacting with an aldehyde on a nitro derivative of a diben-' 4:. The process of producing a vat dye of the anthraquinone series by reacting with a compound capable of splitting ofi? an aldehyde on a leuco compound of an amino dcrivative of dibenzanthrone.

5. The process of producing a vat dye of the anthraquinone series by reacting on an amino derivative of a dibenzanthrone with a compound capable of splitting off an aldehyde and acting'as a reducing agent.

6. The process of producing a vat dye of the anthraquinone series by reacting on a nitro derivative of a dibenzanthrone with a compound capable of splitting off an aidehyde and acting as a reducing agent.

7. The process of producing a vat dye of the anthraquinone series by reacting with sodium formaldehyde sulfoxylate on a nitro derivative of a dibenzanthrone.

8. The process of producing a vat dye of the anthraquinone series by reacting with sodium formaldehyde sulfoxylate on nitro dibenzanthrone.

9. The process of producing a vat dye of the anthraquinone series on the fiber by reacting on nitro-dibenzanthrone with sodium formaldehyde and caustic soda solution in the presence of the fiber.

In testimony whereof we have hereunto set our hands in the presence of two subscribing wltnesses.

OSCAR BALLY. RICHARD METZGER. Witnesses t J. Auto. LLOYD, S. S. BERGER. 

